Which of the following chart/instrument is used for Distance vision Assessment?

Appeared in: GMCH - 2015

Explanation

The Snellen chart is the standardized tool specifically designed for testing distance visual acuity.
The test involves having the patient read progressively smaller lines of letters from a set distance of 20 feet (or 6 meters).
Visual acuity is recorded as a fraction (e.g., 20/20), where the numerator is the distance from the chart and the denominator is the distance at which a person with normal vision can read the same line.
This method directly assesses the eye's ability to see small details at a distance, which is the definition of distance vision.

Option B: The Jaeger chart is used to assess near vision, not distance vision.
Option C: An ophthalmoscope is a diagnostic instrument for viewing the internal structures of the eye, such as the retina and optic nerve. It does not measure visual acuity.
Option D: The Ishihara chart is a screening tool for color vision deficiency (color blindness).

Clinical Relevance

Nursing practice connection: Use the key finding related to Assessment of distance visual acuity to guide bedside assessment, documentation, and the next nursing action.
Assessing visual acuity is a fundamental nursing skill used in various settings, from school health screenings to preoperative assessments, to identify vision problems and the need for referral.
A reading of 20/40 means the patient can see at 20 feet what a person with normal vision can see from 40 feet away. The larger the denominator, the poorer the distance vision.
Nurses must document visual acuity for each eye separately (OD for right eye, OS for left eye) and whether corrective lenses were worn.

How to Approach the Question

First, identify the key concept in the question stem, which is 'Distance vision Assessment'.
Scan the options to see which tool is specifically associated with measuring vision at a distance.
Recall the primary function of each listed chart and instrument.
The Snellen chart is famously used for distance vision tests at 20 feet.
The Jaeger chart is for near vision (reading distance).
The Ophthalmoscope is for looking inside the eye.

Concept Tested & Keywords

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E6 Nursing Fundamentals Potter Perry 12e Part 3 p. 78-80

E6 Nursing Brunner Adult Health 3SA Vol 2 Part 1 p. 85-87

E6 Nelson Textbook of Pediatrics(2024) — Volume 2 p. 1716-1718

Practise the full GMCH - 2015

Attempt every question from this paper in a timed mock, then review the full solution for each one.